import math
def add(x,y):
    return x+y
def sub(x,y):
    return x-y
def mul(x,y):
    return x*y
def div(x,y):
    return x/y
def exactdiv(x,y):
    return x//y
def rem(x,y):
    return x%y
def pow(x,y):
    return x**y
def my_sqrt(x):
    return (math.sqrt(x))
if __name__=="__main__":
    print(add(1,2))
    print(sub(1, 2))
    print(mul(1, 2))
    print(div(1, 2))
    print(exactdiv(1, 2))
    print(rem(1, 2))
    print(pow(1, 2))
    print(math.sqrt(16))